about EJB 3.0 ?

i don't know anything about EJB (nither EJB 3.0 nor any previous version ) i want to learn EJB 3.0, but the final version of 3.0 EJB 3.0 has not been release.

i have heard that in EJB 3.0 all the old concepts have been changed. a) will it be a good idea to start learning the latest version (version prior to 3.0) and to get familiar with EJB and then later upgrade ?

or

b) wait for the EJB 3.0 and start learning EJB 3.0 only when its final version comes